Iis fa lent



Dec. 4, I928. 1,693,671

K. SCHMIDT PORTABLE LIQUID FIRE EXTINGUISHER Filed July 1927 h mn Patented Dee. 4, El a- 1 KARL soar/Lina, or. niionur'rrn; ERMANY. I

j PORTABLE m -Mm EXTENGUISHER.

Asplication 'fileii Ji fi' 8. 1927, Serial No.

This invention relates to a portable liquid fire extinguisher of that type in, which the airspace within the extinguisher is in communication with the outer airby-mea'ns of a 'U-shaped pipe passing from 'the airchamber along the discharge pipe, for the purpose of preventing the liquid being driven out of the apparatus'by the expanding enclosed air.

In the known fire type the narrow pressure compensating pipes possessed a uniform cross-section throughout their length. The consequence was that after raising the apparatus from the charging position into the storage position the liquid which had penetrated into the pressure compensating pipes did not drain into the chainber located adjacent to the bottom of the apparatus, but pistons of liquid or freely the low inner pressure within the extinguish-V er was incapable of forcing into the water seal chamber at the bottom of the extinguisher. The pistons of liquid thus choke the pressure compensating pipes audit was. frequent ly found that extinguishers equipped'with .the known compensating devices yet showed the phenomenon known as driving, by which is meant the unintentionaldischarge of liquid when the air pressure within the eX- tinguisher increases.

According to the present invention this drawback iseliminated by not making the pressure"compensating plpes of un form cross-section throughout, but lncreaslng the cross-section of a portion of them. The nar- T rower portions of the pipesopen into the air spaces to be connected, while the expanded portions of the pressure compensating pipes;

communicate with the water seal chamber. In this way the result is attained that at least the pressure compensating pipe located in the interior of the apparatus takes up a column of liquid which has a different crosssectional area in correspondence with the di i When the ap--' ferent dian'ietei of the pipe. D paratus is raised from the filling posltion into thestorage position the portion-oi the column of liquid of larger cross-sectional area acts strongly drawing or sucking upon the portion of the column of liquid oftlie smaller cross-sectional area, so that the'narrower part of the pressure compensating pipe is completely drained with certainty. No piston of liquid or freely suspended mass of liquid remains in the extended portion ofthe' pressure compensating p1pe,"because the adextinguishers of this to remain clear and unobstructed. to prevent the entry of large volumes of gas into the pressure compensating pipes when -are well known.

shown at 2. In the interior of the appa-I 204,313, and in Germany April 24, 1926.

does not siitiice to holda piston or short col..-

- LUDIl 'Of liquid; The pressurecompensation pipes thus completely. drain their contents into the water seal chamber when the apparatus is raised into the-upright storage position, so that the channel'orconduit placing the air space oi the extinguisher in communioationwith the outer air may be relied upon In order making use of the apparatuspthe pressure compensating tube extending into the air space or the extinguisher s preferably closed hesion of the liquid onthe walls of V by a nozzle-like extension provided with'a .con'iparatively tine admission opening. The cross-sectional area'of this opening is smaller suspended masses remained in the pipes which 1 than the cross-sectional areaoi' the part of the,

pipe upon which the closing member is placed. The drawing afiixed hereto illustrates'in longitudinal section, a portable fire-extin guisher embodying the invention, both e10.

"tremlties being omitted-.. Although a conical ,course, be applied to other designs of extini extinguisher have been omitted as they The filling opening is ratus' there are located the pressure coin- .pensating pipes (Z and e. The pipe (Z opens into the air space 7 of the extinguisher and the pipe 6 lnto the airspace of the discharge pipe I). These tubes cl and e are expanded or made ot-larger internal diameter in their lower portions d and 6 so that the lower portion of the pipe'possesses a larger cross sectional area thanthe upper portion.- The pipe portions d and 6 open at their lower ends-into the water seal chamber 0. The end of the'tube, d located in the air space 7 of the apparatus terminates into a nozzle-like ber g provided'with a line. bore h.

lIIGHl- Variou'sc-hanges and modifications may be -made in the details of my invention Without departlng :trom its spirit or the ambit of" my claims.

I claim as my invention:

1. Ina portable liquid fire-extinguisher having pipes. adapted to putt-he inner air space" in communication 'With the "air space of the discharge pipe and leading into a chamber located near the bottom of said e tinguisher, pipes of Iargrfliameter j dined to said chamber and of smaller diameter opening into said air spaces.

2. In a :portable liquid fire-extinguisher having pipes adaptedto put the inner air space'ini communication with the-air space or the'discharge pipeand leading into-a chamberlocatednear the bottom of said extinguisher, pipes of "larger diameter joined to said chamber and of smaller diameter opening into said air spaces, and a nozzle-shaped member monntedupon the admission opening of the compensation pipe located in the air space of theextinguisher, the cross-sectional ;area of said opening being smaller than the least cross-sectional area ofi'its' compensation pipe. e

In testimony whereof-I are; my signature.

' KARL SCHMIDT. 

